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Errors in shearography measurements due to the creep of the PZT shearing actuator

Filip Zastavnik, Lincy Pyl, Jun Gu, Hugo Sol, Mathias Kersemans (UGent) and Wim Van Paepegem (UGent)
(2014) MEASUREMENT SCIENCE & TECHNOLOGY. 25(8).
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Abstract
Shearography is a modern optical interferometric measurement technique. It uses interferometric properties of coherent laser light to measure deformation gradients on the μm/m level. In the most common shearography setups, the ones employing Michelson interferometer, the deformation gradients in both x- and y-direction can be identified by setting angles on the shearing mirror. One of the mechanisms for setting the desired shearing angles in the Michelson interferometer is using the PZT actuators. This paper will reveal that the time-dependent creep behaviour of the PZT actuators is a major source of measurement errors. Measurements at long time spans suffer severely from this creep behaviour. Even for short time spans, which are typical for shearographic experiments, the creep behaviour of the PZT shear actuator induces considerable deviation in the measured response. In this paper the mechanism and the effect of the PZT creep is explored and demonstrated with measurements. For long time-span measurements in shearography, noise is a limiting factor. Thus, the time-dependent evolution of noise is considered in this paper, with particular interest in the influence of the external vibrations. Measurements with and without the external vibration isolation are conducted and the difference between the two setups is analyzed. At the end of the paper some recommendations are given for minimizing and correcting the here studied time-dependent effects.
Keywords
INTERFEROMETRY, DIGITAL SHEAROGRAPHY, BEAMS, shearography, Michelson interferometer, PZT actuator, creep, measurement noise

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MLA
Zastavnik, Filip et al. “Errors in Shearography Measurements Due to the Creep of the PZT Shearing Actuator.” MEASUREMENT SCIENCE & TECHNOLOGY 25.8 (2014): n. pag. Print.
APA
Zastavnik, F., Pyl, L., Gu, J., Sol, H., Kersemans, M., & Van Paepegem, W. (2014). Errors in shearography measurements due to the creep of the PZT shearing actuator. MEASUREMENT SCIENCE & TECHNOLOGY, 25(8).
Chicago author-date
Zastavnik, Filip, Lincy Pyl, Jun Gu, Hugo Sol, Mathias Kersemans, and Wim Van Paepegem. 2014. “Errors in Shearography Measurements Due to the Creep of the PZT Shearing Actuator.” Measurement Science & Technology 25 (8).
Chicago author-date (all authors)
Zastavnik, Filip, Lincy Pyl, Jun Gu, Hugo Sol, Mathias Kersemans, and Wim Van Paepegem. 2014. “Errors in Shearography Measurements Due to the Creep of the PZT Shearing Actuator.” Measurement Science & Technology 25 (8).
Vancouver
1.
Zastavnik F, Pyl L, Gu J, Sol H, Kersemans M, Van Paepegem W. Errors in shearography measurements due to the creep of the PZT shearing actuator. MEASUREMENT SCIENCE & TECHNOLOGY. 2014;25(8).
IEEE
[1]
F. Zastavnik, L. Pyl, J. Gu, H. Sol, M. Kersemans, and W. Van Paepegem, “Errors in shearography measurements due to the creep of the PZT shearing actuator,” MEASUREMENT SCIENCE & TECHNOLOGY, vol. 25, no. 8, 2014.
@article{4403858,
  abstract     = {Shearography is a modern optical interferometric measurement technique. It uses interferometric properties of coherent laser light to measure deformation gradients on the μm/m level. In the most common shearography setups, the ones employing Michelson interferometer, the deformation gradients in both x- and y-direction can be identified by setting angles on the shearing mirror. One of the mechanisms for setting the desired shearing angles in the Michelson interferometer is using the PZT actuators. This paper will reveal that the time-dependent creep behaviour of the PZT actuators is a major source of measurement errors. Measurements at long time spans suffer severely from this creep behaviour. Even for short time spans, which are typical for shearographic experiments, the creep behaviour of the PZT shear actuator induces considerable deviation in the measured response. In this paper the mechanism and the effect of the PZT creep is explored and demonstrated with measurements. For long time-span measurements in shearography, noise is a limiting factor. Thus, the time-dependent evolution of noise is considered in this paper, with particular interest in the influence of the external vibrations. Measurements with and without the external vibration isolation are conducted and the difference between the two setups is analyzed. At the end of the paper some recommendations are given for minimizing and correcting the here studied time-dependent effects.},
  articleno    = {085007},
  author       = {Zastavnik, Filip and Pyl, Lincy and Gu, Jun and Sol, Hugo and Kersemans, Mathias and Van Paepegem, Wim},
  issn         = {0957-0233},
  journal      = {MEASUREMENT SCIENCE & TECHNOLOGY},
  keywords     = {INTERFEROMETRY,DIGITAL SHEAROGRAPHY,BEAMS,shearography,Michelson interferometer,PZT actuator,creep,measurement noise},
  language     = {eng},
  number       = {8},
  title        = {Errors in shearography measurements due to the creep of the PZT shearing actuator},
  url          = {http://dx.doi.org/10.1088/0957-0233/25/8/085007},
  volume       = {25},
  year         = {2014},
}
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